Table 1.

PDB codes of the proteins analyzed

PDB code	Description	Ref.
1aij	Bacterial photosynthetic reaction center from Rhodobacter spheroides	46
6prc	Bacterial photosynthetic reaction center from Rhodopseudomonas viridis	47
1bcc	Ubiquinol cytochrome c oxidoreductase from chicken heart mitochondria	11
1be3	Ubiquinol cytochrome c oxidoreductase from bovine heart mitochondria	17
1bl8	Potassium channel from Streptomyces lividans	12
2brd	Bacteriorhodopsin from Halobacterium salinarium	14
1fum	Fumarate reductase from Escherichia coli	20
1msl	Mechanosensitive ion channel from Mycobacterium tuberculosis	19
1occ	Cytochrome c oxidase from bovine heart	13